2 * Copyright (C) 2005 Sascha Hauer, Pengutronix
3 * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the version 2 of the GNU General Public License
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/interrupt.h>
21 #include <linux/netdevice.h>
22 #include <linux/delay.h>
23 #include <linux/pci.h>
24 #include <linux/platform_device.h>
25 #include <linux/irq.h>
26 #include <linux/can/dev.h>
27 #include <linux/can/platform/sja1000.h>
32 #define DRV_NAME "sja1000_platform"
34 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
35 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
36 MODULE_ALIAS("platform:" DRV_NAME);
37 MODULE_LICENSE("GPL v2");
39 static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
41 return ioread8(priv->reg_base + reg);
44 static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
46 iowrite8(val, priv->reg_base + reg);
49 static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
51 return ioread8(priv->reg_base + reg * 2);
54 static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
56 iowrite8(val, priv->reg_base + reg * 2);
59 static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
61 return ioread8(priv->reg_base + reg * 4);
64 static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
66 iowrite8(val, priv->reg_base + reg * 4);
69 static int sp_probe(struct platform_device *pdev)
73 struct net_device *dev;
74 struct sja1000_priv *priv;
75 struct resource *res_mem, *res_irq;
76 struct sja1000_platform_data *pdata;
78 pdata = dev_get_platdata(&pdev->dev);
80 dev_err(&pdev->dev, "No platform data provided!\n");
85 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
86 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
87 if (!res_mem || !res_irq) {
92 if (!request_mem_region(res_mem->start, resource_size(res_mem),
98 addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
104 dev = alloc_sja1000dev(0);
109 priv = netdev_priv(dev);
111 dev->irq = res_irq->start;
112 priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
113 if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
114 priv->irq_flags |= IRQF_SHARED;
115 priv->reg_base = addr;
116 /* The CAN clock frequency is half the oscillator clock frequency */
117 priv->can.clock.freq = pdata->osc_freq / 2;
118 priv->ocr = pdata->ocr;
119 priv->cdr = pdata->cdr;
121 switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
122 case IORESOURCE_MEM_32BIT:
123 priv->read_reg = sp_read_reg32;
124 priv->write_reg = sp_write_reg32;
126 case IORESOURCE_MEM_16BIT:
127 priv->read_reg = sp_read_reg16;
128 priv->write_reg = sp_write_reg16;
130 case IORESOURCE_MEM_8BIT:
132 priv->read_reg = sp_read_reg8;
133 priv->write_reg = sp_write_reg8;
137 platform_set_drvdata(pdev, dev);
138 SET_NETDEV_DEV(dev, &pdev->dev);
140 err = register_sja1000dev(dev);
142 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
147 dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
148 DRV_NAME, priv->reg_base, dev->irq);
152 free_sja1000dev(dev);
156 release_mem_region(res_mem->start, resource_size(res_mem));
161 static int sp_remove(struct platform_device *pdev)
163 struct net_device *dev = platform_get_drvdata(pdev);
164 struct sja1000_priv *priv = netdev_priv(dev);
165 struct resource *res;
167 unregister_sja1000dev(dev);
170 iounmap(priv->reg_base);
172 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
173 release_mem_region(res->start, resource_size(res));
175 free_sja1000dev(dev);
180 static struct platform_driver sp_driver = {
185 .owner = THIS_MODULE,
189 module_platform_driver(sp_driver);